How and why do river features change downstream?

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Presentation transcript:

How and why do river features change downstream? Starter: When you think of rivers…what comes to mind? Homework: DUE IN TUES 15th Find the definitions, draw a diagram and learn the definition of the following words for a spot test next week. Erosion Hydraulic action Corrasion Corrosion (solution) Attrition Weathering Physical Chemical Biological Soil Creep Mass Movement

Stages in the development of a River Valley

The river cuts downward to form a ‘V’shaped valley. The river starts to meander

What happens next?

River uses its meanders to cut from side to side eating into the valley Floodplain starts to form 1 2

What happens next?

1 2

Floodplain River bluffs Alluvial deposits River cliff

http://www.youtube.com/watch?v=sfEi8CoPVgc&safe=active

1. Copy the diagram of the drainage basin on page 66 into your books 2 1.Copy the diagram of the drainage basin on page 66 into your books 2. Add on the information from the next slide onto it 3. draw the 3 different cross sections on the upper middle and lower course pg 65 4. Add on the information from page 66

A DRAINAGE BASIN WORD BANK – use these key geographical words to fill in the gaps Source Mouth Confluence Wider Watershed Drainage Basin Flood Plain Tributaries

June 2011

How does a river change from source to mouth? True or False The valley gets narrower The gradient gets steeper You find interlocking spurs in the upper course The watershed is the highland that surrounds the watershed Deltas are found at the river’s mouth Wide flood plains are found in the upper course A confluence is when 2 rivers meet Tributaries are bends in rivers

What are the main features of a river?

http://www.bbc.co.uk/learningzone/clips/watersheds-and-drainage-basins/3238.html Condensation streams Precipitation source river lake watershed mountains runoff Granite tributary Confluence

How and why do river features change downstream? Afon Taff River Severn

What is the water cycle? What role do rivers play?

I haven’t got a ranging pole. Why have I not got a ranging pole?! HELP Mr Latus, I’m stuck!!!!! I am the Pied Piper. Follow me you rats. I haven’t got a ranging pole. Why have I not got a ranging pole?! GCSE fieldwork

What are the main features of a river?

Stages in the development of a River Valley

The river cuts downward to form a ‘V’shaped valley. The river starts to meander

What happens next?

River uses its meanders to cut from side to side eating into the valley Floodplain starts to form 1 2

What happens next?

1 2

Floodplain River bluffs Alluvial deposits River cliff

What happens next?

Homework: Find the definitions, draw a diagram and learn the definition of the following words for a spot test next week. Erosion Hydraulic action Corrasion Corrosion (solution) Attrition Weathering Physical Chemical Biological Soil Creep Mass Movement Homework: Find the definitions, draw a diagram and learn the definition of the following words for a spot test next week. Erosion Hydraulic action Corrasion Corrosion (solution) Attrition Weathering Physical Chemical Biological Soil Creep Mass Movement